1. a shortened form of of, as in o'clock or will-o'-the-wisp.
2. a shortened form of on.

1. the fifteenth letter of the English alphabet, a vowel.
2. any spoken sound represented by the letter O or o, as in box, note, short, or love.
3. something having the shape of an O.
4. a written or printed representation of the letter O or o.
5. a device, as a printer's type, for reproducing the letter O or o.

1. (used before a name in direct address, especially in solemn or poetic language, to lend earnestness to an appeal): Hear, O Israel!
2. (used as an expression of surprise, pain, annoyance, longing, gladness, etc.)

3. the exclamation “O.”

1. object (def. 7).
2. Old.

1. the fifteenth in order or in a series.
2. the Arabic cipher; zero.
3. the medieval Roman numeral for 11.
4. a major blood group, usually enabling a person whose blood is of this type to donate blood to persons of group O, A, B, or AB and to receive blood from persons of group O.
5. oxygen.
6. particular negative.

1. a prefix meaning “descendant,” in Irish family names: O'Brien; O'Connor.

1. an abridgment of ortho-.

1. variant of ob- before m:omission.

1. variant of oo-: oidium.

1. the typical ending of the first element of compounds of Greek origin (as -i- is, in compounds of Latin origin), used regularly in forming new compounds with elements of Greek origin and often used in English as a connective irrespective of etymology: Franco-Italian; geography; seriocomic; speedometer.

1. a suffix occurring as the final element in informal shortenings of nouns (ammo; combo; condo; limo; promo); -o also forms nouns, usually derogatory, for persons or things exemplifying or associated with that specified by the base noun or adjective (cheapo; pinko; sicko; weirdo; wino).
2. a suffix occurring in colloquial noun or adjective derivatives, usually grammatically isolated, as in address: cheerio; kiddo; neato; righto.

1. pint.

1. octavo.
2. off.
3. old.
4. only.
5. order.
6. out; outs.

1. (in prescriptions) a pint.

1. Ocean.
2. octavo.
3. October.
4. Ohio.
5. Old.
6. Ontario.
7. Oregon.

1. the 15th letter and fourth vowel of the modern English alphabet
2. any of several speech sounds represented by this letter, in English as in code, pot, cow, move, or form
3. another name for nought

1. informal, or archaic shortened form of of a cup o' tea

1. oxygen
2. a human blood type of the ABO group
3. a particular negative categorial proposition, such as some men are not married: often symbolized as SoP

4. offence

1. a variant spelling of oh
2. an exclamation introducing an invocation, entreaty, wish, etc

1. (in surnames of Irish Gaelic origin) descendant of

1. short for ortho- (def. 4)

1. used to connect elements in a compound word

1. forming informal and slang variants and abbreviations, esp of nouns

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